JP3369967B2 - Stirling cooling device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a Stirling cooling device equipped with abnormal condition detecting means for detecting various abnormal conditions.

[0002]

2. Description of the Related Art Conventionally, a Stirling cooling device of this type has a compression piston accommodated in a compression cylinder to form a compression chamber, and an expansion piston (displacer) is provided in an expansion cylinder, as disclosed in, for example, Japanese Patent Application Laid-Open No. 5-118687. ) Is configured to form an expansion chamber, and these are communicated with each other to enclose a predetermined amount of working gas such as helium.

Then, the motor reciprocally drives the compression piston and the expansion piston with a phase difference,
By repeating the cycle in which the working gas in the compression chamber is compressed and moved through the heat dissipation heat exchanger and the regenerator, and then expanded and moved from the expansion chamber through the same path, heat is dissipated by the heat dissipation heat exchanger. Cool the expansion chamber. A cooling head is attached to the expansion chamber in a heat exchange manner, and a secondary refrigerant is circulated in the cooling head to cool the cold heat utilization equipment.

According to this structure, a cooling device that uses refrigerants other than CFCs as working gas and is applied to global environmental problems can be provided, and the operating temperature is wide, so that it can be used for commercial and household purposes. In addition to cold heat utilization equipment, low temperature liquid circulator, low temperature incubator, constant temperature bath, heat shock test device, freeze dryer, temperature specific test device, blood / cell storage device, cold cooler, various other cold heat devices, etc. It is applicable to cold heat utilization equipment in the industrial field.

[0005]

In this type of Stirling cooling device, when an abnormality occurs in the motor or pump, the motor must be stopped for safety. Further, it is necessary to stop the motor when the cooling head becomes the freezing temperature of the secondary refrigerant or lower, or when the high temperature head of the compression cylinder becomes abnormally high temperature.

Conventionally, when these various abnormalities occur, the motor is once stopped and automatically restored when a predetermined restoration condition is satisfied. Here, in the case of the above-mentioned abnormal temperature of the cooling head or the high temperature head, it is considered to be temporary because the motor stops for a certain period and returns to the normal value. In the case of an abnormality in the fan or the blower, if the motor is automatically returned to operate the motor, there is a great risk of causing a more serious failure.

The present invention has been made in order to solve the above-mentioned conventional technical problems, and provides a Stirling cooling device capable of appropriately controlling various abnormal states detected by the abnormal state detecting means. It is a thing.

[0008]

According to a first aspect of the present invention, there is provided a Stirling cooling device in which a compression piston is housed in a compression cylinder to form a compression chamber, and an expansion piston is housed in an expansion cylinder to form an expansion chamber. , Which encloses a working gas inside and drives a compression piston and an expansion piston by a drive device, and reciprocates the working gas between the compression chamber and the expansion chamber to cool the expansion chamber, Equipped with an abnormal state detection means for detecting various abnormal states, and a control device for controlling the operation of the drive device based on the output of the abnormal state detection means. In this control device, the abnormal state detection means detects an abnormal state. In this case, the operation of the drive device is stopped, and it is determined whether or not to automatically restore under a predetermined condition according to the content of the abnormality.

In the Stirling cooling device according to the second aspect of the present invention, the compression piston is housed in the compression cylinder to form the compression chamber, the expansion piston is housed in the expansion cylinder to form the expansion chamber, and the working gas is contained therein. By enclosing and driving the compression piston and the expansion piston by the drive device, and reciprocating the working gas between the compression chamber and the expansion chamber,
A cooling head for an expansion cylinder, a high temperature head for a compression cylinder, temperature detecting means for detecting the temperatures of the cooling head and the high temperature head, and a device abnormality detection for detecting an abnormal state of the device. Means and a control device for controlling the operation of the drive device based on the output of each of these detection means, this control device, when the temperature detection means detects an abnormal temperature of the cooling head or high temperature head,
While stopping the operation of the drive unit, if the device abnormality detection means does not detect an abnormality in the device, it automatically recovers under a predetermined condition, and if it detects an abnormality, it keeps the stopped state. is there.

In the Stirling cooling device according to the third aspect of the invention, the compression piston is housed in the compression cylinder to form the compression chamber, the expansion piston is housed in the expansion cylinder to form the expansion chamber, and the working gas is provided inside. By enclosing and driving the compression piston and the expansion piston by the drive device, and reciprocating the working gas between the compression chamber and the expansion chamber,
A cooling head for an expansion cylinder, a high temperature head for a compression cylinder, temperature detecting means for detecting the temperatures of the cooling head and the high temperature head, and a device abnormality detection for detecting an abnormal state of the device. Means, a control device for controlling the operation of the drive device based on the output of each of these detection means, and an alarm device, and the control device is provided when the temperature detection means detects an abnormal temperature of the cooling head or the high temperature head. , While stopping the operation of the drive device, if the device abnormality detection means does not detect the abnormality of the device, it is automatically restored under a predetermined condition, if the abnormality is detected, the stopped state is maintained, Moreover, the alarm device is operated.

In the Stirling cooling device according to the fourth aspect of the present invention, the compression piston is housed in the compression cylinder to form the compression chamber, and the expansion piston is housed in the expansion cylinder to form the expansion chamber. A cooling head for an expansion cylinder, in which the expansion chamber is cooled by enclosing it and driving the compression piston and the expansion piston by a drive device to reciprocally move the working gas between the compression chamber and the expansion chamber. A high temperature head of the compression cylinder, a temperature detecting means for detecting the temperatures of the cooling head and the high temperature head, an equipment abnormality detecting means for detecting an abnormal state of equipment such as a pump and a blower, and an output of each of these detecting means. The controller is provided with a control device for controlling the operation of the drive device based on the above, and an alarm device. If it is issued, the operation of the drive device is stopped, and if the device abnormality detection means does not detect an abnormality in the device, it is automatically restored under a predetermined condition. It is to maintain and operate the alarm device.

According to the present invention, various abnormalities occurring in the Stirling cooling device are detected, and it is determined whether or not to automatically recover under a predetermined condition according to the content of the abnormality.
In the case of a temporary abnormality, automatic recovery is performed and it is caused by a failure of the device, or if it is supposed, it is prohibited to automatically recover and prompt appropriate action, resulting in a more serious failure. It is possible to avoid the above.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a schematic configuration diagram of a Stirling cooling device 1 of the present invention. This Stirling cooling device 1
Has a box-shaped case 2, and a Stirling refrigerator 3 is arranged in the case 2.

The Stirling refrigerator 3 has a cooling head 4. In the cooling head 4, a cold heat refrigerant pipe line 5 for circulating cold heat refrigerant (secondary refrigerant for transporting cold heat generated in the Stirling refrigerator 3 to heat utilization equipment such as a freezer).
Both ends of this cold heat refrigerant pipe 5 penetrate the case 2 and are connected to cold heat refrigerant inlet plugs 6 and outlet plugs 7 provided outside the case 2.

The inlet plug 6 and the outlet plug 7 have an outlet end 9 and an inlet end 1 of a cold heat refrigerant pipe of a cold heat utilization device 8 such as a freezer.
0 is detachably connected. A cold heat refrigerant pump P2 is disposed in the middle of the cold heat refrigerant pipe line 5 and circulates the cold heat refrigerant between the cooling head 4 of the Stirling refrigerator 3 and the cold heat utilization equipment 8.

In addition to the freezer, the cold heat utilization equipment 8 includes the above-mentioned refrigerator, throw-in cooler, low temperature liquid circulator, low temperature incubator for various temperature characteristic tests, and the like.
The cooling device 1 of the present invention can be used by connecting these cold heat utilization devices to the inlet plug 6 and the outlet plug 7.

Next, referring to FIG. 2, the Stirling cooling device 1 of the present invention will be described in detail. The housing 11 of the Stirling refrigerator 3 is made of cast metal, and a cylinder 12 is formed at the top of the housing 11. The interior of the housing 11 is partitioned by a partition wall 13 into a motor chamber 14 and a crank chamber 15. A motor 16 capable of forward and reverse rotation is reciprocated in the motor chamber 14, and a rotational motion of the motor 16 is reciprocated in the crank chamber 15. A rotary reciprocating conversion mechanism section 17 for converting into The opening 18 of the motor chamber 14 and the opening 19 of the crank chamber 15 are closed by lids 20 and 21, respectively, and the inside of the housing 11 is held in a semi-sealed state.

A crankshaft 23, which penetrates the partition wall 13 and is axially supported by the partition wall 13 of the housing 11 and the bearing portions 22 of the lids 20 and 21, is rotatably arranged in the housing 11. The motor 16 includes a stator 24a,
The rotor 24b is rotatably arranged on the inner peripheral side of the stator 24a, and the crankshaft 23 is fixed to the center of the rotor 24b.

The rotary reciprocating conversion mechanism portion 17 includes the crank chamber 1
Crank part 25 of the crankshaft 23 extending in 5
And a connecting rod 26 connected to the crank portion 25,
27 and cross guide heads 28 and 29 attached to the tips of the connecting rods 26 and 27, and function as a drive device for the Stirling refrigerator 3 together with the motor 16.

The cross guide heads 28 and 29 are reciprocally arranged in cross guide liners 30 and 31 provided on the inner wall of the cylinder 12 of the housing 11. The crank portion 25 is formed with a phase difference so that the crank 25b moves ahead of the crank 25a when the motor 16 rotates normally. Incidentally, as this phase difference, a phase difference of 90 degrees is generally adopted.

The cylinder 12 is formed in the upper part of the crank chamber 15 of the housing 11, and the compression cylinder 3
2 and an expansion cylinder 33 located slightly above the compression cylinder 32. Also, cylinder 1
The interior of 2 is separated from the crank chamber 15 and the motor chamber 14 below by a partition wall 71.

Then, inside the housing 11 above the partition wall 71 (that is, the compression cylinder 32 and the expansion cylinder 33).
(In the cylinder 12 including), as a working gas, for example,
Helium, hydrogen, nitrogen, etc. are enclosed in a predetermined amount (for example, 25 kg / square centimeter as working gas pressure). The compression cylinder 32 has a compression cylinder block 34 fixed to the housing 11 with bolts or the like,
A compression piston 36 provided with a piston ring 35 reciprocates in the space of the compression cylinder block 34.
Then, the upper end portion (compression space) of this space becomes a compression chamber (high temperature chamber) 37, and the working gas therein is compressed to a high temperature.

The upper end of the compression cylinder 32 corresponding to the compression chamber 37 serves as a high temperature head 96. A high temperature head temperature sensor 91 as temperature detecting means (abnormal state detecting means) is attached to the high temperature head 96 in a heat exchange manner.

The compression piston rod 38 has one end fixed to the compression piston 36, the other end extending below the partition wall 71 via an oil seal 39, and is rotatably connected to the cross guide head 28 by a pin. The reciprocating compression piston 36 reverses the sliding direction at the top dead center and the bottom dead center, so the speed becomes zero, and the speed is slow near the top dead center and the bottom dead center, and the volume change amount per unit time is small. Also becomes smaller. In addition, the maximum speed is reached at the respective intermediate points when moving from bottom dead center to top dead center and from top dead center to bottom dead center, and the amount of volume change due to movement of the piston per unit time is also maximum. .

On the other hand, the expansion cylinder 33 has an expansion cylinder block 40 fixed to the upper portion of the compression cylinder 32 by bolts or the like.
The expansion piston 42 provided with the piston ring 35a reciprocally slides in the space. Then, the upper end portion (expansion space) of this space becomes an expansion chamber (low temperature chamber) 41, and the working gas therein expands to a low temperature. Also, the expansion piston 4
The lower end of the space in the expansion cylinder block 40 located below 2 serves as a buffer chamber 72.
Communicates with the space inside the compression cylinder block 34 below the compression piston 36.

The expansion cylinder block 40 facing the buffer chamber 72 is provided with a pressure sensor 74 as an abnormal state detecting means. This pressure sensor 74 is
The pressure of the working gas in the buffer chamber 72 is detected and an output is generated.

The expansion piston rod 43 has one end fixed to the expansion piston 42, the other end extending below the partition wall 71 via an oil seal 44, and is rotatably connected to the cross guide head 29 by a pin. The reciprocating expansion piston 42 reverses the sliding direction at the top dead center and the bottom dead center, so the speed becomes zero, the speed is slow near the top dead center and the bottom dead center, and the amount of change in volume per unit time is small. Also becomes smaller. In addition, the maximum speed is reached at the respective intermediate points when moving from bottom dead center to top dead center and from top dead center to bottom dead center, and the amount of volume change due to movement of the piston per unit time is also maximum. . Further, the expansion piston 42 moves ahead of the compression piston 36 by a phase of 90 degrees.

The expansion cylinder block 40 is provided with a manifold 45 through which working gas flows in and out of the compression space of the compression cylinder 32 from below in the drawing, and further, a heat radiation heat exchanger 46 and a regenerator 47. And expansion chamber 4
The passages 48 to 1 communicate with each other in sequence and are arranged in an annular shape. Near the upper end of the compression cylinder block 34,
A communication hole 49 that communicates between the compression chamber 37 and the manifold 45 is formed, whereby the compression chamber 37 and the expansion chamber 41 are formed.
Is a communication hole 49, a manifold 45, a heat dissipation heat exchanger 4
6, the regenerator 47 and the passage 48 are sequentially connected to each other. Further, the space below the buffer chamber 72 and the compression piston 36 is also the chambers 37, 41.
Is in communication with.

The passage 48 may be a cooler by disposing a heat exchanger in this portion.

The heat radiating heat exchanger 46 is provided with a cooling water circulation line 54.
Also, the cooling water is circulated by being connected to the radiator 55 via the cooling water pump P1. The cooling water that has undergone heat exchange by the heat radiation heat exchanger 46 and is heated is air-cooled by the blower 73 of the radiator 55. A pipe is branched and connected to the cooling water circulation pipe line 54, and a water reservoir tank 57 is connected to this pipe through a reservoir valve 56. Also,
An air vent 58 and a drain valve 59 are connected to the radiator 55.

The heat radiating heat exchanger 46 may be an air cooling type having air cooling fins instead of the water cooling type as described above.

As already described, the cooling head 4 is connected to the cold heat utilization equipment 8 through the cold heat refrigerant pipe line 5 and the cold heat refrigerant pump P2, and circulates the cold heat refrigerant. A suction tank 65 is provided in the cold heat refrigerant pipe line 5.
A cold / heat refrigerant reservoir tank 67 is connected to the suction tank 65 via a reservoir valve 66.
A drain valve 68 is connected to the suction tank 65. Further, the cold heat refrigerant pipe 5 has an air vent 6
9 is connected. Ethyl alcohol, HFE, PFC, nitrogen, helium, etc. are used as the cold heat refrigerant.

Further, a cooling head temperature sensor 92 as a temperature detecting means (abnormal state detecting means) is attached to the cooling head 4 in a heat exchange manner.

In the Stirling refrigerating apparatus 1 of the embodiment, the Stirling refrigerating machine 3 includes a compression cylinder 32 and an expansion cylinder 3.
By using the two pistons No. 3 and No. 3, the volume fluctuation of the space filled with the working gas in the Stirling refrigerator 3 is increased, so that the Stirling refrigerator 3 having a large refrigerating capacity can be provided.

Next, FIG. 3 shows a block diagram of the control device 81 of the Stirling cooling device 1. The control device 81 is composed of a general-purpose microcomputer, and its input has the output of the pressure sensor 74 and the motor 1
6, the output of a motor current sensor 87 as an abnormal state detecting means for detecting the current of 6 and the output of a pump P1 current sensor 88 as an equipment abnormal detecting means (abnormal state detecting means) for detecting the current of the cooling water pump P1. And an output of a pump P2 output current sensor 89 as an equipment abnormality detecting means (abnormal state detecting means) for detecting a current of the cold heat pump P2, an output of the high temperature head temperature sensor 91, and the cooling head temperature sensor. Equipment abnormality detection means (abnormal state detection means) for detecting the output of 92 and the current of the blower 73
Of the blower current sensor 93 as an example, and the motor 1
The reverse phase detection sensor 94 of No. 6 and the output of the operation panel 86 provided with various operation switches are connected.

The output of the control device 81 includes the motor 16, the cooling water pump P1, the cold heat refrigerant pump P2,
A blower 73, an LED display 82 (provided on the operation panel 86) that constitutes an alarm device, and an alarm buzzer 83 are connected.

The operation of the Stirling cooling device 1 having the above configuration will be described with reference to the flowchart of FIG.
The control device 8 uses the operation switches (or
It is determined whether or not the operation request signal is output from the cold heat utilization equipment 8), and if the operation request signal is output, the control of each equipment described below is executed.

First, the controller 81 operates the motor 16, the pumps P1 and P2, and the blower 73. When the motor 16 is operated and the crankshaft 23 is rotated in the forward direction, the cranks 25a and 25b of the crank portion 25 are rotated 90 degrees out of phase with each other. Then the cranks 25a, 25b
The cross guide heads 28 and 29 attached to the tips of the connecting rods 26 and 27 are connected to the cross guide liner 3 via the connecting rods 26 and 27 that are rotatably connected to each other.
It slides back and forth in 0 and 31. As a result, the compression piston rod 38 is attached to each of the cross guide heads 28 and 29.
The compression piston 36 and the expansion piston 42, which are connected to each other via the expansion piston rod 43, reciprocate with a phase difference of 90 degrees.

While the expansion piston 42 is moving 90 degrees ahead and moving slowly near the top dead center, the compression piston 36 moves rapidly near the middle toward the top dead center to compress the working gas. The compressed working gas passes through the communication hole 49 and the manifold 45 and flows into the heat radiating heat exchanger 46. The working gas that radiates heat to the cooling water in the heat radiating heat exchanger 46 is cooled by the regenerator 47 and flows into the expansion chamber 41 through the passage 48.

When the compression piston 36 is slowly moving in the vicinity of the top dead center, the expansion piston 42 rapidly moves toward the bottom dead center, and the working gas flowing into the expansion chamber 41 expands rapidly and cools. (Cooling action) occurs. As a result, the top portion of the expansion cylinder block 40 in the cooling head 4 portion that surrounds the expansion space is cooled to a low temperature. In the normal state, the working gas pressure in the expansion chamber 41 at this time is 25 ± 8 kg / square centimeter.

Then, in the cooling head 4, the cold heat refrigerant circulating in the cold heat refrigerant pipe 5 is cooled. Expansion piston 42
Is moving from bottom dead center to top dead center, the compression piston 3
6 is from the intermediate position to the bottom dead center, the working gas passes through the passage from the expansion space, flows into the regenerator 47, and stores the cold heat of the working gas in the regenerator 47. The cold heat stored in the regenerator 47 is reused to re-cool the working gas sent from the compression chamber 37 through the heat radiating heat exchanger 46 as described above.

The cold heat refrigerant cooled in the cooling head 4 is sent from the cold heat refrigerant pipe 5 and the cold heat refrigerant outlet plug 7 to the cold heat refrigerant pipe in the cold heat utilization equipment 8 such as a freezer,
Freezing (a refrigerating action in a refrigerator) is exerted in the cold heat utilization device 8. In the cold heat utilization device 8, the cold heat refrigerant absorbs heat, exerts a cooling action, is sent from the cold heat refrigerant pipe to the cold heat refrigerant inlet plug 6 of the cooling device, passes through the cold heat refrigerant pipe 5, and returns to the cooling head 4. And cooled there.

In this way, the cold heat refrigerant circulates between the cooling head 4 of the Stirling refrigerator 3 and the cold heat utilization equipment 8,
The cold heat refrigerant is cooled by the Stirling refrigerator 3, and the cold heat refrigerant exerts a cooling action in the cold heat utilization device 8. Hereinafter, the same cycle is repeated.

The cooling water that has undergone heat exchange in the heat radiation heat exchanger 46 flows from the cooling water circulation pipe 54 to the heat radiator 55, where it is air-cooled by the blower 73 and circulated again to the heat radiation heat exchanger 46.

Next, the control at the time of abnormality by the control device 81 will be explained based on the flow chart of FIG. in this case,
The control device 81 determines in step S1 whether or not the refrigerator 3 is in operation. If the refrigerator 3 is in operation, in step S2 each sensor 74,
The data output by 87, 88, 89, 91, 92, 93 and 94 is fetched (input), and it is determined in step S3 whether or not this data is abnormal.

That is, based on the data output from the pressure sensor 74, the working gas pressure in the buffer chamber 72 is input to determine whether or not the pressure is below a predetermined value (for example, 20 kg / square centimeter). If normal at this time, the buffer chamber 7
The working gas pressure in 4 is 25 ± 0.5 kg / square centimeter. In this case, it is determined that there is no abnormality, and when it is less than the predetermined value, it is determined that there is abnormality.

Further, according to the data output from the high temperature head temperature sensor 91, it is determined that there is no abnormality when the temperature of the high temperature head 96 is equal to or lower than a predetermined temperature, and it is determined that there is abnormality when the temperature is high. Further, based on the data output from the cooling head temperature sensor 92, it is determined that there is no abnormality when the temperature of the cooling head 4 is higher than the freezing temperature of the cold heat refrigerant, and it is determined that there is an abnormality when the temperature is below the freezing temperature. To do.

When the reverse phase detection sensor 94 detects a reverse phase, it is determined that there is an abnormality, and the current sensors 87,
Based on the data output from 88, 89, and 93, it is determined that there is no abnormality when a normal current flows through each device, and that there is an abnormality when an abnormal current flows due to motor lock or the like.

When the control device 81 determines in step S3 that there is an abnormality in the output of any of the above sensors, the control device 81 proceeds to step S4. In step S4, the content of the abnormality is determined, and it is determined whether the data of the pump P1 current sensor 88, the pump P2 current sensor 89, or the blower current sensor 93 is abnormal. The motor 16, the pumps P1 and P2, and the blower 73 are stopped.

That is, when the abnormality is only the overheating of the high temperature head 96 or the overcooling of the cooling head 4, the process proceeds to step S7.

Next, in step S8, it is judged whether or not the data output from each sensor meets a predetermined return condition, and the operation of the motor 16 and the like is stopped until they match, and if they match, a step is executed. Proceed to S9 to automatically restart the operation (automatic return).

On the other hand, if the content of the abnormality includes the current of the pump P1, the current of the pump P2, or the current of the blower 73, the process proceeds to step S5 and the LED display 82 displays the abnormality. The alarm buzzer 83 is activated. This prompts the administrator to maintain these devices. Then, in step S6, the motor 16, the pumps P1 and P2, and the blower 73 are stopped. In this case, the control device 81 does not restart the operation of the motor 16 unless the administrator manually restores the switch on the operation panel 86.

In this way, the control device 81 detects various abnormalities that have occurred in the Stirling cooling device 1 and determines whether or not to automatically restore them under predetermined conditions according to the contents of the abnormalities. In case of a temporary abnormality such as overheating of the machine or overcooling of the cooling head, automatic recovery is performed.In the case of a failure due to a pump or blower, automatic recovery is prohibited and appropriate measures are urged. It is possible to avoid inconvenience leading to a failure.

Although the two-piston type Stirling refrigerator 3 is used in the above embodiment, when other types of Stirling refrigerator 3 such as a displacer type (for example, the expansion piston 42 is made of synthetic resin) are used. It is also effective.

[0055]

As described in detail above, according to the present invention, various abnormalities occurring in the Stirling cooling device are detected, and it is determined whether or not to automatically recover under a predetermined condition according to the contents of the abnormality. Therefore, in the case of a temporary abnormality, it will automatically recover, and if it is due to a device failure, or if it is supposed, it will be prohibited and automatic action will be urged to prompt an appropriate action. It is possible to avoid the inconvenience leading to.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a Stirling cooling device of the present invention.

FIG. 2 is a detailed view of the Stirling cooling device of the present invention.

FIG. 3 is a block diagram of a control device of the Stirling cooling device.

FIG. 4 is a flowchart showing a program of a control device of the Stirling cooling device.

[Explanation of symbols]

1 Stirling cooling device 3 Stirling refrigerator 4 cooling head 16 motor 32 compression cylinders 33 expansion cylinder 36 compression piston 37 Compression chamber 41 Expansion chamber 42 Expansion piston 73 blower 81 Control device 82 LED display 83 Alarm buzzer 88 Pump P1 current sensor 89 Pump P2 current sensor 91 High temperature head temperature sensor 92 Cooling head temperature sensor 93 Blower current sensor 96 high temperature head

Front page continued (72) Shinji Yamamoto 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Kenichi Kagawa 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (56) Reference JP-A-11-173691 (JP, A) JP-A-2000-18745 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F25B 9 / 14 520

Claims (4)

(57) [Claims] 1. A compression piston is accommodated in a compression cylinder to form a compression chamber, an expansion piston is accommodated in an expansion cylinder to form an expansion chamber, and a working gas is enclosed inside the compression piston by a drive device. In the Stirling cooling device for cooling the expansion chamber by driving the expansion piston and reciprocally moving the working gas between the compression chamber and the expansion chamber, an abnormal state detecting means for detecting various abnormal states, A control device for controlling the operation of the drive device based on the output of the abnormal state detection means is provided, and the control device stops the operation of the drive device when the abnormal state detection means detects an abnormal state, A Stirling cooling device, which determines whether or not to automatically recover under a predetermined condition according to the content of an abnormality. 2. A compression piston is accommodated in a compression cylinder to form a compression chamber, an expansion piston is accommodated in an expansion cylinder to form an expansion chamber, and a working gas is enclosed inside the compression piston by a drive device. In the Stirling cooling device that cools the expansion chamber by driving the expansion piston and the expansion piston and reciprocally moving the working gas between the compression chamber and the expansion chamber, a cooling head of the expansion cylinder and a compression cylinder of the compression cylinder. High temperature head, temperature detecting means for detecting the temperatures of the cooling head and the high temperature head, equipment abnormality detecting means for detecting an abnormal state of equipment, and control for controlling the operation of the drive device based on the outputs of these detecting means The control device is provided with a device for operating the drive device when the temperature detecting means detects an abnormal temperature of the cooling head or the high temperature head. Is stopped, if the apparatus abnormality detecting means does not detect an abnormality of the equipment is automatically restored under a predetermined condition,
A Stirling cooling device that maintains a stopped state when an abnormality is detected. 3. A compression piston is accommodated in a compression cylinder to form a compression chamber, an expansion piston is accommodated in an expansion cylinder to form an expansion chamber, and a working gas is enclosed inside the compression piston by a drive device. In the Stirling cooling device that cools the expansion chamber by driving the expansion piston and the expansion piston and reciprocally moving the working gas between the compression chamber and the expansion chamber, a cooling head of the expansion cylinder and a compression cylinder of the compression cylinder. High temperature head, temperature detecting means for detecting the temperatures of the cooling head and the high temperature head, equipment abnormality detecting means for detecting an abnormal state of equipment, and control for controlling the operation of the drive device based on the outputs of these detecting means A controller and an alarm device, and the control device, when the temperature detecting means detects an abnormal temperature of the cooling head or the high temperature head, Along with stopping the operation of the moving device, if the device abnormality detection means does not detect the abnormality of the device, it is automatically restored under a predetermined condition, if the abnormality is detected, the stopped state is maintained, And a Stirling cooling device which operates the alarm device. 4. A compression piston is accommodated in a compression cylinder to form a compression chamber, an expansion piston is accommodated in an expansion cylinder to form an expansion chamber, and a working gas is enclosed inside the compression piston by a drive device. In the Stirling cooling device that cools the expansion chamber by driving the expansion piston and the expansion piston and reciprocally moving the working gas between the compression chamber and the expansion chamber, a cooling head of the expansion cylinder and a compression cylinder of the compression cylinder. A high temperature head, a temperature detecting means for detecting the temperatures of the cooling head and the high temperature head, an equipment abnormality detecting means for detecting an abnormal state of equipment such as a pump and a blower, and a drive device of the driving device based on the output of each of the detecting means. A controller for controlling the operation and an alarm device are provided. In the controller, the temperature detecting means has an abnormal temperature of the cooling head or the high temperature head. If it detects, it stops the operation of the drive device,
When the device abnormality detecting means does not detect an abnormality of the device, the device automatically recovers under a predetermined condition, and when the device detects an abnormality, the stopped state is maintained and the alarm device is operated. Stirling cooling device.